汽车和家电行业对高品质大截面塑料模具钢的需求量逐渐增大,但随着塑料模具钢截面厚度的增大,其出现粗晶的可能性也增大,这使得合理的热处理工艺设计显得尤为重要.通过添加钛来抑制高温处理过程中奥氏体晶粒的长大行为,并着重研究微合金钛元素对非调质塑料模具钢奥氏体晶粒长大的影响规律.研究发现,含0.03%钛的非调质塑料模具钢在均质化温度高于1 050 ℃时具有较好的抗晶粒粗化能力,原因是组织中晶界附近存在一定量的以Ti(C,N)为主的析出相.通过以上研究建立了奥氏体晶粒长大模型,该模型可有效预测非调质塑料模具钢高温均质化过程中的奥氏体晶粒长大规律.
The demand of automotive and appliance industry for high-quality large section plastic mold steel is gradually increased.However, with the increase of the thickness of plastic mold steel, the possibility of the occurrence of coarse grain is also increased, which calls for a reasonable design of heat treatment process.The austenite grain growth behavior during high temperature treatment was hindered by adding titanium, and the effects of Ti addition on austenite grain growth behavior of non-quenched and tempered (NQT) plastic mold steel were emphatically studied.The results show that the NQT plastic mold steel containing 0.03% Ti has better resistance to grain coarsening when the homogenization temperature is higher than 1 050 ℃, due to the Ti(C, N) precipitation disperse around the grain boundaries.Based on the experimental results, the mathematical models of grain growth were established, which can be used to predict the austenite grain growth of NQT plastic mold steel during high temperature homogenization.
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